Question about neck stability on Rics

I'm looking into getting a Rickenbacker 4001/4003 and have heard a few (apparently isolated) problems that people have had with the neck, so I'm trying to get a read on how reliable they are in reality. If you have (or have had) a Ric 4001 or 4003 (4 string), please just drop a quick line or two concerning your experiences with the Ric neck. Thanks a lot!

I've had my 1981 4001 for nine months now, and the neck hasn't budged a bit since I set it up. It's actually more stable than the graphite reinforced neck on my 1999 Fender AmStd Jazz.

Just remember - don't try to adjust a 4001 neck flatter by just cranking down the trussrod nuts. You need to "assist" the neck into position, then snug the nuts down. The 4003 doesn't require this precaution.

I've owned 4001's and have never had to readjust the neck once i had done it to suit my needs.
I currently own two 4003's and my experience with them is that once they are a couple of years old adjustments aren't required anymore. My '91 needed pretty regular tweaking (about every 3 months) for about two years then I haven't touched it since. And my '98 only took about a year for me to get it settled in (but it was hanging in a store for almost a year). I don't know why they would need more adjustments when new but they have been rock solid for me since through pretty varying and sometimes harsh conditions.